/*
 * @Descripttion:
 * @version:
 * @Author: zhangfan
 * @email: 2207044692@qq.com
 * @Date: 2020-07-28 16:51:25
 * @LastEditors: zhangfan
 * @LastEditTime: 2020-07-28 17:43:51
 */
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default {
  install(Vue, options) {
    Vue.prototype.getPdf = function (id, title) {
      html2Canvas(document.querySelector(`#${id}`), {
        // allowTaint: true
        useCORS: true, //看情况选用上面还是下面的，
      }).then(function (canvas) {
        let contentWidth = canvas.width
        let contentHeight = canvas.height
        let pageHeight = (contentWidth / 592.28) * 841.89
        let leftHeight = contentHeight
        let position = 0
        let imgWidth = 595.28
        let imgHeight = (592.28 / contentWidth) * contentHeight
        let pageData = canvas.toDataURL('image/jpeg', 1.0)
        let PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage()
            }
          }
        }
        PDF.save(title + '.pdf')
      })
    }
  },
}
